1 files changed, 121 insertions, 0 deletions
diff --git a/drivers/soc/renesas/rcar-rst.c b/drivers/soc/renesas/rcar-rst.c
new file mode 100644
index 000000000..d9c1034e7
--- /dev/null
+++ b/drivers/soc/renesas/rcar-rst.c
@@ -0,0 +1,121 @@
+/*
+ * R-Car Gen1 RESET/WDT, R-Car Gen2, Gen3, and RZ/G RST Driver
+ *
+ * Copyright (C) 2016 Glider bvba
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of_address.h>
+#include <linux/soc/renesas/rcar-rst.h>
+
+#define WDTRSTCR_RESET		0xA55A0002
+#define WDTRSTCR		0x0054
+
+static int rcar_rst_enable_wdt_reset(void __iomem *base)
+{
+	iowrite32(WDTRSTCR_RESET, base + WDTRSTCR);
+	return 0;
+}
+
+struct rst_config {
+	unsigned int modemr;		/* Mode Monitoring Register Offset */
+	int (*configure)(void *base);	/* Platform specific configuration */
+};
+
+static const struct rst_config rcar_rst_gen1 __initconst = {
+	.modemr = 0x20,
+};
+
+static const struct rst_config rcar_rst_gen2 __initconst = {
+	.modemr = 0x60,
+	.configure = rcar_rst_enable_wdt_reset,
+};
+
+static const struct rst_config rcar_rst_gen3 __initconst = {
+	.modemr = 0x60,
+};
+
+static const struct of_device_id rcar_rst_matches[] __initconst = {
+	/* RZ/G is handled like R-Car Gen2 */
+	{ .compatible = "renesas,r8a7743-rst", .data = &rcar_rst_gen2 },
+	{ .compatible = "renesas,r8a7745-rst", .data = &rcar_rst_gen2 },
+	{ .compatible = "renesas,r8a77470-rst", .data = &rcar_rst_gen2 },
+	/* R-Car Gen1 */
+	{ .compatible = "renesas,r8a7778-reset-wdt", .data = &rcar_rst_gen1 },
+	{ .compatible = "renesas,r8a7779-reset-wdt", .data = &rcar_rst_gen1 },
+	/* R-Car Gen2 */
+	{ .compatible = "renesas,r8a7790-rst", .data = &rcar_rst_gen2 },
+	{ .compatible = "renesas,r8a7791-rst", .data = &rcar_rst_gen2 },
+	{ .compatible = "renesas,r8a7792-rst", .data = &rcar_rst_gen2 },
+	{ .compatible = "renesas,r8a7793-rst", .data = &rcar_rst_gen2 },
+	{ .compatible = "renesas,r8a7794-rst", .data = &rcar_rst_gen2 },
+	/* R-Car Gen3 */
+	{ .compatible = "renesas,r8a7795-rst", .data = &rcar_rst_gen3 },
+	{ .compatible = "renesas,r8a7796-rst", .data = &rcar_rst_gen3 },
+	{ .compatible = "renesas,r8a77965-rst", .data = &rcar_rst_gen3 },
+	{ .compatible = "renesas,r8a77970-rst", .data = &rcar_rst_gen3 },
+	{ .compatible = "renesas,r8a77980-rst", .data = &rcar_rst_gen3 },
+	{ .compatible = "renesas,r8a77990-rst", .data = &rcar_rst_gen3 },
+	{ .compatible = "renesas,r8a77995-rst", .data = &rcar_rst_gen3 },
+	{ /* sentinel */ }
+};
+
+static void __iomem *rcar_rst_base __initdata;
+static u32 saved_mode __initdata;
+
+static int __init rcar_rst_init(void)
+{
+	const struct of_device_id *match;
+	const struct rst_config *cfg;
+	struct device_node *np;
+	void __iomem *base;
+	int error = 0;
+
+	np = of_find_matching_node_and_match(NULL, rcar_rst_matches, &match);
+	if (!np)
+		return -ENODEV;
+
+	base = of_iomap(np, 0);
+	if (!base) {
+		pr_warn("%pOF: Cannot map regs\n", np);
+		error = -ENOMEM;
+		goto out_put;
+	}
+
+	rcar_rst_base = base;
+	cfg = match->data;
+	saved_mode = ioread32(base + cfg->modemr);
+	if (cfg->configure) {
+		error = cfg->configure(base);
+		if (error) {
+			pr_warn("%pOF: Cannot run SoC specific configuration\n",
+				np);
+			goto out_put;
+		}
+	}
+
+	pr_debug("%pOF: MODE = 0x%08x\n", np, saved_mode);
+
+out_put:
+	of_node_put(np);
+	return error;
+}
+
+int __init rcar_rst_read_mode_pins(u32 *mode)
+{
+	int error;
+
+	if (!rcar_rst_base) {
+		error = rcar_rst_init();
+		if (error)
+			return error;
+	}
+
+	*mode = saved_mode;
+	return 0;
+}